iphone 15 unlock or iphone 15 lock to Mint Mobile

My folks have an account with Mint Mobile, (talk, text, and data) and I would like to buy iphone 15 (eSIM) for them. Old phone not getting updates, etc.
Should I be looking at iphone locked to Mint or unlocked iphone ? Which will be easier to activate without too much of customer support.
I'm asking this because they live in one state and I'm in another state. Right now I'm staying with folks for the holidays, and can set up the phone but I will leaving 10 days, and they may be unable to do activation, etc. Thank you.

Anyone ?

I have one

- From the OP -
5 Feb 2024.
Just bought a new iphone 15 - unlocked - straight from Apple. Device is working great. : )
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